Search Term
This operator searches for the exact phrase within speech marks only.For example: “ssl certificates”

OR
This self explanatory operator searches for a given search term OR an equivalent term. For example: “wildcard ssl” OR “san ssl”

– (and +)
The – operator removes pages that mention a given term from search results. For example, if you were searching for information about Manchester, but didn’t want your results to be polluted by information about the city’s red clothed football team, you could search for the following: Manchester -united
Using + forces Google to return common words that might ordinarily be discarded, for example: Peanut Butter +and Jam

~
Adding a tilde to a search word tells Google that you want it to bring back synonyms for the term as well. For example, entering “~set” will bring back results that include words like “configure”, “collection” and “change” which are all synonyms of “set”.

site:
This searches only within a given domain – delectable when you want to only search within the confines of a particular site. For example: site:twitter.com tomisko6677

link:
Use this operator to find links to a domain. For example: link:tomisko.com

allintitle: (and also intitle:)
Searches only for sites with the given word(s) in the page title.

allintext: (and also intext:)
This operator searches only for sites where the given word(s) are in the text of the page.

allinanchor: (and also inanchor:)
This shows sites which have the keyterms in links pointing to them, in order of the most links.

allinurl (and also inurl:)
Similar to the last few, but fetches results where the key words are in the URL.

allinpostauthor: (and also inpostauthor:)
Exclusive to blog search, this one picks out blog posts that are written by specific individuals.

+ (immediately before query)
Google is now craftily providing a wide range of synonym results in response to relevant search queries.

related:
Simple: it returns searches for sites that are related to a given domain.

loc:placename
This operator brings back results from pages in a given place.

daterange:
This query will search within a given date and time range, but is a bit unusable because dates must be entered in the tricky Julian format.

location:
This is another news operator that allows you to search for articles by location: